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Dave’s E30 has seen various configurations over the years including a few different powertrains. His current install, a BMW S54 engine from an E46 M3, required precise engine control along with the use of advanced motorsport functions. For this, the Emtron ECU system was a perfect choice.We retained every single component of the original engine, including VANOS, electric throttle, idle speed valve and all OEM sensors. We also upgraded the O2 sensors to high performance, wide-range versions that